4x+9=249
4x=240
x=60
y+2y=45
3y=45
y=15
6x-x=125
5x=125
x=25
3y-6=48
3y=54
y=18
x-360=312
x=360+312
x=672
m÷0.6=4.5
m=0.6*4.5
m=2.7